Adolescent pregnancy is a problem that increases worldwide and represents a great risk for adolescents, both in health and in their environment and future due to the consequences that this trigger since it not only affects the adolescent but also the family. Objective: To identify the association between the structural and social intermediate determinants of health and pregnancy in adolescents. Methodology: A quantitative study, an observational, analytical, association, cross-sectional comparative design was carried out in 229 adolescents of which 32 are pregnant and 197 are not, aged 12 to 17 years. The data were obtained from a survey and univariate and bivariate analysis was performed. Results: the average age is 17 years old, attending high school and upper secondary level, 10.9% have stopped studying mainly due to pregnancy and secondly due to economic problems, 39.3% have a relative who had a pregnancy before the age of 17 and most of them answered that it was the mother who had the pregnancy. The main reason adolescent girls have sex is for love, with the boyfriend being her first sexual partner. The adolescents say they have a relationship based on love and affection with their parents, grandparents and partner. According to the information given to them on family planning, 70.7% argue that it is the parents who give them the information and under the beliefs that they have. Conclusions: The main cause of a pregnancy at an early age is due to not receiving adequate information and the one they receive is based on the cultural beliefs of the parents and growth patterns. The information given to them on family planning methods is considered very deficient, because it is not provided by health personnel.